live render to "slapcomp enabled" Render Gallery not working

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Hiya,

version: Houdini 21.0.440

When live render to render gallery with the slapcomp enabled, is there a way to see the update lively?

In this simple setup with a white dome light, when slapcomp is enabled, I don't see the render updating live while changing the dome lighting color.


When slapcomp is disabled in Render Gallery, the render updates lively as dome light color changing.


Simple slapcomp setup with Live Recook enabled.


I am expecting the rubber toy to update lively as upstream lighting changes against the background plate configured in the COP slapcomp.

Hope it's just me missing something obvious.

Thanks!
Edited by noicevstime - Dec. 12, 2025 10:17:23

Attachments:
Snipaste_2025-12-12_10-_0.jpg (192.2 KB)
Snipaste_2025-12-12_10-_1.jpg (181.3 KB)
Snipaste_2025-12-12_10-_2.jpg (79.3 KB)

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essentially what one can achieve in Scene View with Karma CPU and slapcomp enabled, I'd like to achieve it through the Live Render node in Render Galleary.

Like a live slapcomp with the CG lighting updating, in Render Gallery. Is it possible? This way I have the Scene View still in Houdini VK.

Attachments:
2025-12-12_23-11-31.jpg (172.3 KB)

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> Houdini 21.0.440

Can you please upgrade to a newer build (I think 21.0.559 is the latest production build)? We've done some work to address something that sounds very similar to what you've reported.

If the issue persists, please log a bug, thanks!
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Thanks Rob! Working nicely with 21.0.559.

Cheers.
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